Tuesday, 31 March 2020Colorado will file a legal challenge against President Donald Trump and the U.S. Environmental Protection Agency for Tuesday’s announced rollback of vehicle-fuel-efficiency regulations, Attorney General Phil Weiser announced. The move comes more than a year after Colorado Air Quality Control Commission members put into place an upgraded standard that will require increased fuel efficiency from all new vehicles sold in this state beginning in 2022. The commission later OK’d a new rule requiring…